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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0385fbf0381662f5a1b29b6014029c5ef35afb1e8006bfb5f79c3c59df71d945' 
  AND token = 'T11seJS4BDuc9CRwQwJvUaIcoDSnx5+YN4/bLPUKP38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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