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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dad4269aa6a993af019f4725a1e6d3cb130d985bf2c3bf36219e78f97e4f4212' 
  AND token = 'RR9kyqREuVN6ya4eWHkCWuF9+0pvv8JOBooHuDfa9eo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}