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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '43e15a715596a63b314cbf40b332f5e06d8dd240e2c6537d97693534734ff62a' 
  AND token = 'Z4wseyJTR4X+E1DA1vuokgzbiNtmPgXEU5p+fAcW+Cg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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