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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd9950b53e3063e6ae160e15cf0a248cfc1b06a00eb13997e9341ee06d5d22a2f' 
  AND token = 'CqCBI1AeTeGj+dzx6WSuE09lWD9PtQCOF+M2FJO4VdQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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