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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ef50035b2ae3cb00da70e3929d19a9f51e14bef73a2534ce78bd300724a6e1a9' 
  AND token = 'tHjR9oE/c9xzrkTlYDfzTjGq2x58DdBj98himBnHm8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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