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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '281583a1a4fc89822643f60e975f450851f4c14b2d447ecc71a6b7afb58e0929' 
  AND token = 'x9953hOY6t6V34Bqrz0qB+x2blU2i+oXp3CkObiUKyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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