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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0b0846d17385a98ee0a684ab6a34fb0dd9fcbf3282f8b1fdcdc52f90c076d2e5' 
  AND token = 'Hpa7DSe+GWVMODqf7aYq5BSNnRT6y8Hl9OQC2LyoufM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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