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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b40cd7a9ea9754a1a27514e6f309d2bcfa91f32f539c46cc039c2f9c97adf0b7' 
  AND token = 'BP27eIKym8+wxxctLhT59H2tLj12cJ47UdYhmRWFSMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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