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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '69cd6fbfe9411863bd6d6d6ed2f6fe2164e8d1c27382972cc0cd32754e0d3ced' 
  AND token = 'fzLeTIGrrLSVwvCzV+fT3Fdub7o1SClJkbR+yzOM2QM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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