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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '46e96aa8eb5cdafedcb7db4df4c2ed804d568a579e0b2d5191e6fb877b75d11c' 
  AND token = 'weTKnxJw/EHHQ5nogr8ITQaF2vXmqqcD500JHZTI98M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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