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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b6963115b9c3cf328d4645a4c16fd652801ff47d57294a427f52b109d5a2331b' 
  AND token = 'F15yk51CWly4wuftyO2RtE7BITlPn1uK3Am2ihYyYUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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