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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '29023fa9eb4322c076e8a0dca8b09fc3fae77844cd4e2c0c9f21076267429102' 
  AND token = '7P5sUzqwrzHJ0pziLVCNi0q/MsSk5bFM+HwsJRi8g/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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