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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '28b10d27f0b728d94888269b8f2ffb40e6cd03eba3a4c60d0c64eff51fc6e5d5' 
  AND token = 'bS7/rX7Nby189ZQghQVnBSY5gCGQA74hxcvBFeWEcio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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